umm you could try walking him right up on squaters so he see's them get up infront of him or if the other dogs bring back live to hand u could drop one for him.
trick is to just persist with a biter the more you handle them the more they'll learn its not a bad thing and in regards to work ive had a couple of ferrets given to me from pet homes and they have worked perfectly fine just again needs time
currently using a clulite myself with a £20 12v battery from tool station nice and light set up and can handle fair sized fields lamps also got a handy secondary bulb for fences and things
yea im with this one haha, nah i hold back legs with one hand with my otre hand at the base of its head were neck and head meet then just pull with a slight twist of my head holding hand
i use a cluelite works fine in small and medium sized fields its nice and light has extral bulb for jumoing fences and only needs a light battery although any of the lamps the guys have mentioned are also good.